I am doing Root Cause Analysis for some Pipe transport lines between Reactor and regenerator ( for Pyridine production plant in our industry) carrying high pressure and temperature catalyst (powdered SILICA) which is nitrogen purged for its transport . We are using SS 316 steel pipes which requires very frequent maintenance at weld joints at anchor points and bends which are mostly due to high erosion, thermal stresses, vibration etc. I would like to know what other pipe material is currently used for such transport lines enduring such conditions? if possible please give me some links. Your suggestions would me most helpful. Thanks. Suresh Chandra Kerketta

>If intended service permits the use 304 material,you can >very well choose high carbon 304H,which can withstand some >amount of erosion combined with refractory lining. Or >otherwise you have choose cobalt addition SS for better >erosion resistance. hi! Krish, I would like to know more about this cobalt addition SS (for better erosion resistance). I tried looking at the compositions of various SS but couldn't find one with cobalt added. Thanks. Suresh.

Better to have a cold wall design using calculated type and thickness of refractory layering under consultation with your licensors and original project manager. regards